It appears that the remote web server is affected by a remote format
string issue. Using a specially-crafted URL containing a format
string specifier, an unauthenticated remote attacker can crash the
affected application and possibly execute arbitrary code on the remote
host.

See also :

http://www.securityfocus.com/archive/1/445262/30/0/threaded

Solution :

Unknown at this time.

Threat Level:

Medium / CVSS Base Score : 5.6
(AV:R/AC:H/Au:NR/C:P/I:P/A:P/B:N)

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